Parashas Bamidbar
וְעַ֣ל ׀ שֻׁלְחַ֣ן הַפָּנִ֗ים יִפְרְשׂוּ֮ בֶּ֣גֶד תְּכֵ֒לֶת֒ וְנָתְנ֣וּ עָ֠לָ֠יו אֶת־הַקְּעָרֹ֤ת וְאֶת־הַכַּפֹּת֙ וְאֶת־הַמְּנַקִּיֹּ֔ת וְאֵ֖ת קְשׂ֣וֹת הַנָּ֑סֶךְ וְלֶ֥חֶם הַתָּמִ֖יד עָלָ֥יו יִהְיֶֽה׃
Over the table of display they shall spread a blue cloth; they shall place upon it the bowls, the ladles, the jars, and the libation jugs; and the regular bread shall rest upon it.
Torah Temimah points to TT / Menachos related (verified).
ולחם התמיד עליו יהיה — מכאן ללחם הפנים שאינו נפסל במסעות.
English: “And the continual bread shall be upon it” — from here [we learn] that the bread of the Presence is not invalidated by the journeys.
Custom
Chazal derive that the showbread is not disqualified by being moved during the desert travels.